(19)
(11) EP 1 186 402 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.10.2003 Bulletin 2003/40

(43) Date of publication A2:
13.03.2002 Bulletin 2002/11

(21) Application number: 01307496.8

(22) Date of filing: 04.09.2001
(51) International Patent Classification (IPC)7: B29D 30/68, B26D 7/26, B26D 1/00, B60C 11/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 07.09.2000 JP 2000271006

(71) Applicant: Bridgestone Corporation
Tokyo (JP)

(72) Inventors:
  • Kawashima, Masafumi. c/o Bridgestone Technical Ctr
    Kodaira City, Tokyo (JP)
  • Syudou, Satoru. c/o Bridgestone Technical Center
    Kodaira City, Tokyo (JP)

(74) Representative: Whalley, Kevin 
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)

   


(54) Method and apparatus for forming carved grooves on green tires


(57) A method and an apparatus (1) for forming a carved groove (g) for a lug groove of a green tire (G) capable of forming a carved groove of a necessary depth without being influenced by variation of outer diameters of the green tire, utilizing a cutter (2) on an outer circumferential surface of a green tire before curing, wherein a distance sensor (8) is moved along a portion to be carved on the outer circumferential surface of the green tire to measure outer diameters of the portion to be carved, cut shape data for a green tire having an ideal shape stored in memory beforehand is revised on the basis of the measured outer diameters, and the cutter is moved in accordance with the revised cut shape data for carving.







Search report